Hard to tell, but the unthreaded end almost looks like a worn down anode.
In any case, this doesn't look like something that broke off recently based on the level of corrosion.
IMO, where I would start looking is on the raw water system on the generator. Specifically, I would start at the heat exchanger and look for the anode holder.
My theroy is that it might have been removed and was misplaced. A replacement was installed. And finally that one rolled out from where ever it was hiding.
Ted
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